Tire locating ring assembly for retreading molds



E. A. GLYNN v L2,659,104

TIRE LOCATING RING ASSEMBLY FOR RETREADING MOLDS 3 Sheets-Sheet l w m. l..

INVENTOR ATTORNEYS Edwin Glynn mi: M

Nov. 17, 1953 Filed May 13, 195o Nov. 17, 1953 E, A. @LYNN 1`IRE LOCATING RING ASSEMBLY FOR RETREADING MOLDS Filed May l5, 1950 3 Sheets-Sheet 2 .Edwin H. Glynn ui mi 'Arronnsvs NOV. 17, 1953 l E, A GLYNN 2,659,104

TIRE LOCATING RING ASSEMBLY FOR RETREADING MOLDS Filed May 13, 1950 5 SheeLS-Sheet 3 BY www12 ATTORNEYS i mounted onv theprimary ring.-

Patented Nov. 17, 1953 TIRE LOCATING RING ASSEMBLY FOR RETREADING MOLDS Edwin A. Glynn, Lodi, Calif., assignor to Super Mold Corporation of California, Lodi, Calif., a

corporation of California Application May 13, 1950, Serial No. 161,854

' 5 claims. (cl. is-is) This invention pertains in general to tire retreading molds. Y

A major object of this invention is to provide a tire retreading mold with a novel device for locating and restraining the tire beads during a retreading operation whereby the tire is held in proper position and the tread vulcanized straight and true on the tire.

With low pressure tires as new in use, the side walls are very flexible and, unless positively located, the tire tends to skew in the mold, resulting in an oir-center tread. It is an important object of this invention toprovide a device which is eiective to positively locate the tire in a true position in the mold and hold the tire in such position throughout the retreading operation.

Another object of the invention is to accomplish the result by engaging the tire beads with rings disposed to position said beads concentric to the mold axis and symmetrical to the retreadv matrix in the mold. f

A further object or" the invention is to mount the rings rigidly and directly on the skirts of corresponding body sections of the mold whereby -to conveniently obtain the desired concentricity and spacing of said rings and the engaged tire beads. p f

An additional object of the invention is to provide a tire bead engaging ring assembly which signed ior ease and economy of manufacture;

the device being simple but rugged in structure.

Still another object of the invention is to provide a tire bead engaging ring assembly which is practical and reliable,V and yet exceedingly eiec-v tive for the purpose for, which it is designed.

.These objects are vkaccomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings: f

-Fig. lz is a radial section of a tire retreading mold tted with the present invention.

Fig. 2 is an end elevation of one ofthe primary,

tire bead `engaging rings, detached.

Fig. 3 is a fragmentary end elevation of on vrof the attachment rings, detached. v Figs.4 d-G inclusive are fragmentary radial sec tions umstrati'ng different attachment' rings as screws 26;' theclamps" lilbngaging over the 'en- Referring now more particularly to the characters of reference on the drawings, the invention is here shown as embodied in a tire retreading mold of the horizontal or laid-down type; the numeral I indicating the mold body generally.

Such mold body I comprises a pair of annular, matching body sections 2, each of which includes a side skirt 3 and a steam chamber Il. The side skirts 3 are formed with an enlarged strengthening iiange 5 at their inner edges.

The mold body I encloses a matrix comprised of matrix halves Ei secured in corresponding body sections 2; the matrix halves t including side skirts which terminate adjacent but short of the inner edges of the side skirts 3 of body 'sections 2.`

The tire, as engaged in the mold body VVI forretreading, is shown at 8; such tire having new tread material or Camelback 9 thereon which seats in the matrix.v

The crown portion of the tire, together with the new tread material or camelback 9,"is positively urged against the matrix by means of an air bag I supported in the tire by what is known as an inside curing rim II. .v I

The tire. side Vwalls I2. extend inwardly from opposite sides of theinsidecuring rimV I'I, and unless the side walls i 2,. together with'ithe tire beads I3, are properly located and stabilized, the tire 8 may skew in the mold, with the side walls I2 slipping by opposite sides of the' inside curing rim I I. If such skewing occurs the new tread v'is .not vulcanized true and straight on the'tire.'

' VTo avoid such undesirable eventuality the mold is itted with a novel tire locating ring'asse'mbly, as follows: l'

The tire beads I3 are engaged andpositively the matrix. A

The primary, tireV bead engagingYringsfI-tQ-inf cludeannularieet I5;A` an annular'shoulder- I6;

The feet i I 5 `project toand a locator flange il. ward each other from the shoulders It, and the locator Iianges Il are-peripherally notched, Vas at I8, for matching engagement overthe inner the correspondin'gsideskirt 3.

The. rings I4 are held in place'by hook clamps I9 attached .to the locatorVA flanges EII by cap corner of the enlarged'strengtheniiig flange 5 of larged strengthening 'anges 5f Withthe described tire-meeting ring asseiiitiyI Vwhich Letters Patent are desired:

the tire beads I3 are automatically positioned, and held in said position, upon closing of the body sections 2; the rings I4 then being disposed so that said tire beads I3 are concentric to the mold axis; are spaced apart a predetermined distance; and lie symmetrical to the matrix. As so located and restrained the tire beads I3 hold the tire 8 true in the mold; this being especially advantageous in connection with low pressure type tires which have flexible side walls, and which would otherwise tend to skew in said mold.

Under certain working conditions it is desirable that the tire beads be located and restrained with lesser spacing than shown in Fig. l. To accomplish this a pair of snap-on attachment rings 2 I, one of which is shown in Fig. 4, are employed. Each snap-on attachment ring 2| includes an annular attachment flange 22 which engages on the foot I of the corresponding primary ring I4. Each attachment ange 22 is releasably held in place by a plurality of spring-- pressed detents 23 carried in mounting bosses 24 formed in circumferentially spaced relation about the primary ring I4.

Each attachment ring 2| includes a tire bead engaging foot 25 disposed axially inwardly of the foot I5; the result being that the tire beads when the attachment rings 2| are used, are located with lesser spacing than in Fig. l. As the feet I5 and 25 are of the same diameter, they are for use with tires of a corresponding diameter To employ the ring assembly with tires of lesser diameter, but with a bead spacing, as in Fig. 4, the attachment ring 26, as in Fig. 5, is formed with a tire bead engaging foot 21 having a correspondingly lesser diameter; the attachment ring 26 being secured to the primary ring I4 in the same manner as in Fig. 4.

In Fig. 6 the assembly is shown as arranged for use with a tire of lesser diameter than in Fig. l, but with the same bead spacing. Here the attachment ring 2B seats in matching relation against the foot I5 and shoulder I6 of the primary ring I4; being held in place, as before, by the spaced spring-pressed detents 23. The

tire bead foot 29 of the attachment ring 28 is alined with the foot I5, but is of greater diameter whereby to accommodate the smaller tire.

The tire locating rim assembly, whether the primary rings I4 or the latter plus the described attachment rings are in use, provides a positive and effective device for properly locating the tire beads and restraining them at predetermined points so that the tire, during `the retreading operation, lies true in the mold, and the new tread is vulcanized straight about the tire.

The term retreading as used herein is to be interpreted asV meaning tire tread replacement tail may be resorted to as do not form a departure from the spirit of the invention, as dened by the'appended claims.

Having thus described the invention, the following is claimedvas new and useful, and upon 1. A tire locating device for atire retreading said device comprising a pair of tire bead engaging rings disposed in the mold concentric to the axis thereof and in axially spaced relation radially inwardly of but symmetrical to the matrix, the rings having annular tire bead engaging feet projecting toward each other, means securing the rings to corresponding body sections, and attachment rings adapted to be secured in matching relation to the feet of said first named rings; the attachment rings each having an annular tire bead engaging foot disposed laterally inwardly of the foot of the corresponding one of said rst named rings.

2. A tire locating device for a tire retreading mold which includes a body having separable annular body sections and a matrix in the body, said device comprising a pair of tire bead engaging rings disposed in the mold concentric to the axis thereof and in axially spaced relation radially inwardly of but symmetrical to the matrix, the rings having annular tire bead engaging feet projecting toward each other, means Vsecuring the rings to corresponding body sections, and attachment rings adapted to be secured in matching relation to the feet of said rst named rings; the attachment rings each having an annular tire bead engaging foot disposed radially inwardly of the corresponding one of said rst named feet.

3. A tire locating device for a tire retreading mold which includes a body having separable annular body sections and a matrix in the body, said device comprising a pair of tire bead -en gaging rings disposed in the mold concentric to the axis thereof and in axially spaced relation radially inwardly of but symmetrical to the .ma-tnx, each ring having an annular tire bead engaging foot, means securing the rings to corresponding body sections, attachment rings adapted to t on the feet of the iirst named rings and each having a bead engaging foot oiiset from the foot of the corresponding iirst named ring,

Vthe attachment rings being adapted to be disposed in matching engagement with said rst named rings, and means adapted to releasably secure the matchingly engaged rings together.

4. A tire locating device for a retreading mold including, with a matrix-retaining mold body having side skirts, each skirt terminating in an endless outwardly enlarged annular ange defining an opening concentric with the axis ,of the mold; a pair of tire-bead engaging rings disposed in said opening, each ring including a portion bearing against the laterally inner face of one of the skirts, and means removably secur- 'ing each ring in place in connection with the lcorresponding skirt; clamping elements disposed radially of the mold said means comprising `the mold and provided with facing tire-bead engaging feet; each ring being formed with a .peripheral notch facing laterally out and away Y from the'axis of the ring and one wall of said notch forming an" annular shoulder to tsaid EDW'IN A. GLYNN.

References Cited in the le 0f this patent UNITED STATES PATENTS Name Date Stengel Sept. 21, 1915 Number Number Number Name Date Woock June 13, 1933 Rhinevault June 13, 1939 Beckman Nov. 28, 1939 Drennan May 18, 1943 Bacon, Jr. Apr. 27, 1948 Heintz July 4, 1950 Kent June 10, 1952 FOREIGN PATENTS Country Date Australia June 29, 1931 

